Method of making preformed packing



May 3, 1949.

J. T. WONG METHOD OF MAKING PREFORMED Filed June 8, 1945 PACKING 2 She ets-Sheet 1 JAMES 7. WONG.

' M LW' J. T. WONG METI IOD MAKING- PREFORMED PACKING May 3, 194 9.

2 Sheets-Sheet 2 Filed June 8, 1.945

FIG. 2

FIG. 4

JAMES T. WONG FIG. 6

Patented May 3, 1949 ME TH 01 OFzMAKINGRRiEEQRMZEDz; PACKING. 1

JamesTSW'cm-g, Vallejo, Califi Application: J une 8; 194-5, Serial: No. 598,346

(Cl. 154-331)..v

(Granted-1 underrthe act of '=Ma'rch 3'; 1883; as 1 amended April 130;.1928; 370" '0'; G; 757

2 Claims.

tended for use in electric "cable stuffingtalics; eliminatingthe necessity lot the: previous method ofszhandr packing the stufiingxtu-be about electric; Hand packing of electric'cable stuffing cabletubes is eliminatedpnnew installations by inser ing preformed bulkhead tube packing made, accordingtor. this invention; through the tubes before thecables'are installed;

A further object of this invention is to provide a method for making preformed packing suitable for use in glands or stufiing tubes of any nature.

With the foregoing and other objects in view, the invention consists in the construction, combination and arrangement of parts hereinafter set forth, claimed and illustrated in the drawings in which:

Fig. 1 is a perspective view of the preformed packing making machine of this nature.

Fig. 2 is a sectional fragmentary View on line 22 of Fig. 1.

Fig. 3 is a sectional partly fragmentary view on line 33 of Fig. 1.

Fig. 4 is a sectional view on line it of Fig. 3.

Fig. 5 is an enlarged partly sectional fragmentary view showing the completed packing ready to be discharged, and

Fig. 6 is a perspective sectional view of the packing made according to the method of this invention.

There is shown at ii! the packing making machine of this invention which includes a table ll supported on legs I2 having foot plates 13. The side legs l2 are connected by braces It which in turn support a cross brace l5. Mounted on the table I l is apair of vertical beams it which in turn rigidly support a bridge plate ll. Adjustably and fixedly secured to this bridge plate it by means of a threaded end [8 is a mandrel 28, the mandrel extending vertically downward and being adjusted in position to terminate just above the surface of the table II over a suitable opening 2! in the table II. Supported on the table It is a plate 22 having a gateway 23 therein, wherein is slidably Patent N03:

2% pported a gate 24 adapted to be moved-to open and-close thetable opening-2i. Thegate Zfici pen and close tableopening 2''! by? means of a lever 25-pivoted-to-th -m 1.

atone-end and provided-with an operating handl 21 at the other end .1

Supported over the table openingiflfiby means ofa flange-ZB-Jisa .cylinder"Stigsurroundingrth lower end oat-mandrel 20.," The innendiametersoifizzi the cylinder til-"is greater'thanc the diameter of; :J

the: mandrel '20 .by' an zannularwamountrsubstansatiallywequa-l =to.the annular;thicknessofrthc.pr formed pa'ckingtl shown in Fig-.15 which is made'fe' therein.

An annular plunger 32; :of'za 'size: to sli-dablwfit'c about mand-relzZil-and into the cylinder Bit-BS1119,- A ported on 'the'crossistripss-ti of a verticallyrmovableplatform 3t adjustablwmonnted.onzthe were.- tical-ly movable :rods 35.: Thesemrodsr at:=. thei-r:-*

---upper ends. extend through the bridgeiplate tl,

being provided with nuts 36 for adjustably limiting their upward movement. Pistons 37 secured at the upper ends of rods 35 on top of coil springs 38 within spring tubes 49 serve to keep the rods 35 at the top limit of their movement permitted by the adjusting nuts 36 beneath the bridge plate H. The lower ends of rods 35 extend through suitable openings in the plate 22 and table I l and end in inturned fingers 4| extending into a triangular lever 42 whose apex 43 is pivotally secured to a foot lever 44 having a pivotal connection 45 on the cross brace lb. The other end of lever 44 is provided with a foot pedal 66. Obviously this machine can be modified to be power operated instead of pedal operated.

In operation the springs 38 normally hold the plunger 32 at the upper limit of its movement. When in this position, packing material is manually wound about that portion 20 of the mandrel 20 which is visible between the top of cylinder 30 and the bottom of plunger 32. In one form of packing made by this machine a strip of packing of card consistency is first Wound about the mandrel portion 20 and then foot pedal 46 is depressed, causing plunger 32 to force this first portion of packing 50 into the annular space between the bottom of the mandrel 20 and the inside of cylinder 30 on top of gate 24. The pedal 46 is released, permitting the plunger 32 to be raised by the springs 38 to its original position. A packing 5! of softer consistency is then wound about the mandrel portion 20' and then compressed against the first portion only within cylinder 30. A third portion of packing material 52 of a consistency similar to the first portion is then placed on the mandrel portion 20' and compressed against the previously compressed portions of packing. The packing 3| is thus completed and then the handle 21 is grasped to cause the lever 25 to open the gate 24 whereupon the pedal 46 is depressed again, causing the completed packing 3| to be discharged through the table opening 2|, whereupon the machine is empty, ready for a new preformed packing to be made thereon. As will be apparent, the mandrel 20, the cylinder 30 and the plunger 32 are easily removable and replaceable and may be replaced by similar articles of somewhat diiferent size, thus making it possible to make packing of various sizes on the same machine by merely substituting an appropriately sized mandrel, plunger and packing.

Other modifications and changes in the num ber and arrangement of the parts may be made by those skilled in the art without departing from the nature of this invention, within the scope of what is hereinafter claimed.

The invention herein described and claimed may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor,

What is claimed is:

1. A method of preforming a packing comprising spirally winding a strip of hard packing about a mandrel into a cylindrical form, applying pres sure axially of the cylindrical form While confining it against deformation, spirally winding a strip of soft packing about the same mandrel into a cylindrical form and placing it axially of the first formed packing portion, applying pressure axially of the soft packing form against the hard packing form while confining both packing portions together against deformation, then spirally winding a hard packing about the same mandrel into a cylindrical form and moving it axially against the soft packing form by applying pressure axially thereagainst to complete the packing and confining the completely formed packing against deformation while the axial pressure is applied and thereafter releasing the completely formed packing from the mandrel and from confinement.

2. A method of preforming a packing comprising spirally winding a strip of packing about a mandrel into a cylindrical form and applying pressure axially of the cylindrically formed pack- 7 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 338,358 Pratt Mar. 23, 1886 487,019 Knowlton Nov. 29, 1892 1,697,539 Olsson et a1 Jan. 1, 1929 1,702,958 Bard Feb. 19, 1929 1,840,449 Hubbard et a1 Jan. 12, 1932 2,205,910 Raybould June 25, 1940 FOREIGN PATENTS Number Country Date 539,466 Great Britain Sept. 11, 1941 

